|1970s : 20-100mm|
Lens designer Gordon H. Cook designed the 35mm Cooke 20-100mm, T3.1 Varotal zoom lens, released in 1971. It was the first high quality zoom designed for professional motion picture photography that incorporated a totally new design concept that has remained the basis for all Cooke zoom lenses subsequently produced. It was produced through the late 1980s.
The lens was made with a sealed front focus unit and fixed front element that eliminated the risk of dirt and moisture being drawn into the lens and allowed for easy fitting of matte boxes and filter holders onto the front. The lens was enhanced with anti-reflective wide-band Varomag high performance coatings. This advanced technology achieved new standards in shadowed area definition, light transmission and durability, in addition to giving ghost and flare-free characteristics.
Gordon H. Cook received the 1988 Academy of Motion Picture Arts and Sciences, Gordon E. Sawyer Award for this and other technological advancements during his career as an optical designer.